III. Solve each problem. Write your answers and solutions on a separate sheet of paper. 1 . What is the charge of an ion if it has 5 protons and 7 electrons? 2. What is the electrostatic force of attraction between a -7.8 x 106 C charge and a +2.3 x 106 charge if they are separated by a distance of 0.5 m? 3. A titanium rod is 6 m long and 7 mm in diameter. Compute its resistance if the resistivity of the material is 3.76 x 10-8 0 -m. 4. The heating element in a water heater has a resistance of 34 . and has been plugged into a 240-V outlet. How much electric power is consumed by the iron? 5. Two long parallel wires are 7 cm apart. They carry currents of 3 A and 8 A in opposite directions. What is the force between the two wires per meter of wire length